Sprocket-wheel



No. 6|3,756. Patented Nov. 8, |898. G. T. BUDDLE.

SPROCKET WHEEL.

(Application led Nov. 24, 1897.)

(No Model.)

UNITED ATRNT Fries.

GEORGE T. BUDDLE, OF CHICAGO, ILLINOIS.

SPROCKET-WHEEL.

SPECIFICATION forming part of Letters Patent No. 613,756, dated November 8, 1898.

Application iiled November 24, 1897. Serial No. 659,702. (No modeL) To all whom t may concern:

Be it known that I, GEORGE T. BUDDLE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois,have invented a new and useful SprocketlVheel, of which the following is a specification.

This invention relates to gearing of the type comprising a sprocketwheel and a sprocket-chain, and has for its object to reduce the friction between the cooperating elements to a minimum amount, whereby the powerl is proportionately increased and the life of the gearing prolonged.

The invention consists of a gear-wheel of approximately square outline vand having teeth at the corners which form continuations of the contiguous sides and intermediate teeth forming guides to retain the sprocket or drive chain in position, the sides of the gear-wheel being curved outward slightly, so as to obviate noise which is produced by having the sides straight.

For a full understanding of the merits and advantages of the invention reference is to be had to lthe accompanying drawings and the following description.

In the drawings, Figure l shows asprocketgearing constructed in accordance with this invention. Fig. 2 is a detail view of the improved sprocket-wheel.

- Corresponding and like parts are referred to in the following description and indicated in both views of the drawings by the same reference characters.

The sprocket-wheel l is substantially of square form, and the sides or edges between the corners are slightly convened to engage with the sprocket-chain and prevent the noise which would be incident to having said sides straight. The teeth 2 at the corners form continuations of the contiguous sides and are parallel with the edges or sides relatively in the advance. These teeth 2 sustain the pulling strain and are disposed with reference to the relative size of the sprocket-wheel and the drive-chain cooperating therewith, so as to engage with an open link and cause the chain to make a square turn at the corners of the Wheel. The teeth 3, intermediate of the active teeth 2, form guides and engage with open links of the sprocket-chain 4; to prevent its disengagement from the sprocketwheel. Any means which will hold the sprocket-chain in engagement with the gearvary according to the size of the wheel.

wheel may be substituted for the guide-teeth 8; but the latter present the simplest construction for this purpose.

The sprocket-gear is adapted to rotate in the direction indicated by the arrow, and this direction of rotation fixes the relation of the sides and the active teeth 2, which latter, as shown, are parallel and wholly within the plane of the advancing side. If the sprocketwheel were sufficiently small, there would be no need for providing the intermediate guideteeth 3, and the number of the latter will By having the active teeth 2 form continuations of the contiguous sides at the corners they are relieved in a great measure of the strain or load, which latter is received directly upon the corners of the wheel, the teeth 2 supplementing the pulling act-ion and preventing any lateral slipping of the drive-chain. By having the load sustained by the corners or corner-teeth of the sprocket-wheel the friction is reduced to the smallest amount possible and is materially less than in the con` struction of gearing where every tooth engages with the links of the sprocket-chain and bears a proportionate amount of the strain or load.

Having thus described the invention, what is claimed as new is l. A sprocket wheel of approximately square form having its edges or sides of equal length and slightly convexed, and having a like number of teeth at each edge, the front or advancing teeth being at the corn ers and forming continuations of the contiguous sides, substantially as shown for the purpose specified.

2. A sprocketwheel of approximately square form having its edges or sides of equal length and slightly convened, and having a like number of teeth at each edge, the front or advancing teeth being at the corners and forming continuations of the contiguous sides, and the rear teeth terminating a short distance from the corners and set in from the adjacent sides, substantially as shown for the purpose specified.

In testimony that l claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

GEORGE T. BUDDLE.

Witnesses:

orro C. R. HANssnN, J ORN F. STARR.

IOO 

